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Finding the Fourth Proportional to 976.89, 1,464.54 and 391.65

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Solution

The fourth proportional to 976.89, 1,464.54 and 391.65 is: 587.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.89 : 1,464.54 = 391.65 : x
  2. Step 2: Convert to fraction form
    976.89/1,464.54 = 391.65/x
  3. Step 3: Cross multiply
    976.89x = 1,464.54 × 391.65
  4. Step 4: Simplify right side
    976.89x = 573,587.09
  5. Step 5: Solve for x
    x = 573,587.09/976.89
  6. Step 6: Final answer
    x = 587.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.